Lap-joint for roofing.



L. J B. SCHNUG.

LAP JOIN T FOR ROOFING.

APPLICATION FILED OCT. 26, I916.

Patented Mar. 27, 1917.

images LL15 m-s NU E the construction of roofin Diego, in the county ofSan Diego and State of California, have invented certain new and usefulImprovements in Lap-Joints 'for Roofing; and I do declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in members, particularly corruated sheet won.

The princi 8. object of the invention is to provide roo g members ofsheet metal I which are provided with means so that when they are lacedin overlapping position, water will e prevented from creeping backthrough the joint.

A secondary object is to provide a very simply constructed roofingmember which may be readily-formed by tools of ordinary construction.

With these and other objects in view, the invention resides in the novelfeatures of construction, combination and arrangement of parts whichwill be hereinafter more particularly described and claimed as shown inthe drawings wherein:

Figure 1 represents a plan view of a p01: {ion of one of myimprovedroofing memers;

Fig. 2 is a cross sectional view showing two of the members arranged inoverlapping position; and

Fig. 3 is a similar view on the plane of the line 3-3 of Fig. 2.

In the preferred embodiment, the sheet metal from which my improvedroofing members are formedis corrugated, the ribs 1 which form theridges of the corrugations extending longitudinally of the sheets Scomposing the members. The two outermost ribs 1' on one edge of thesheet, which are overlapped by the adjacent sheet and one of whichordinarily constitutesthe nailing rib, are provided in their crowns withlongitudinal rows of projections 2, one row being formed on each rib.'The projections 2 Specification of Letters Patent.

application filed October 26, 1916. Serial No. 12?,8i7.

Patented Titer. 2?, tear.

on one rib 1' are arranged out of transverse alinement with those on theadjacent rib l as shown in Fig. 1 of the drawings.

These projections 2 are formed by pressing the s eet metal outwardly atpredetermined points, thus providing concave-convex studs which arecircular in lan view. Any number of these studs may e formed and theyare designed to maintain all portions of the edge of one sheet spacedfrom and out of contact with the other sheet except at the tops of theprojections, as shown in Fig. 2. In this figure it will also be notedthat the studs are formed only at one edge of each sheet, the outer ornailing ribs 1" adjacent the other edge being plam and similar to thosein the intermedlate portions.

By providing an air space between the adjacent overlapping edges of thesheets of metal composing the roofing, water is prevented from creepingbetween the joints and causing the roof to leak. It is well known thatthe lapped joints of corrugated roofs frequently leak to a eater orlesser extent due to capillarity. Since the upper sheet of the roofingengages the lower sheet only at the tops of the studs 2, suificientspace will be provided to prevent this action. Furthermore, theprovision of two longitudinal rows of studs will more effectivelyprevent this action than a single row, inasmuch as the edge of the uppersheet is liable to touch the lower in the latter case.

In addition to the advantages above enumerated, it may be pointed outthat by locating the projections 2 on the nailing rib, the accumulationof moisture around the nails which are driven through said ribs, isprevented. It will thus be clear that a great diiiiculty has beenovercome since the nails will not so rust as to permit them to weaken asnow occurs upon corrugated metal roofs in which the seams contactclosely.

I claim as my invention A rectangular roofing sheet formed of metalcorrugated into spaced symmetrical ribs extending longitudinally of saidsheet, the rib or ribs at one edge of the sheet which are intended to beoverlapped being stamped outwardly at longitudinally spaced points alongthe crown thereof to space the lap ing my hand in the presence of twosubscribing rib or ribs of an overlapping sheet rom witnesses.

said first named rib or ribs whereby the accumulation of moisture in theseam and around any nails through said ribs is prevented.

In testimony whereof I have hereunto set LOUIS J. B. SCHNUG.

Witnesses:

MARoUs W. Ronsms, JoHN S. HUGHES.

